Landing at a rival firm alongside old flame Christie (Atsma), Hannah navigates scandalous affairs, big-figure settlements and fraught relationship battles – coming head to head with Ruth and impulsive sister Nina (Scholey) in the bitter divorce of Goldie (Syal) and multi-millionaire husband Davey (Tompkinson). Meanwhile, the marriage of younger sister Rose (Button) looms on the horizon.

When their estranged father returns after 30 years the sisters are forced to confront their past.

Facing the reality of her dad’s abandonment, and reconnecting with ‘the one who got away’ Christie, Hannah begins to question her relationships with the men in her life – including her seemingly contented marriage to the smart and affable Nathan (Stephen Mangan).

On being cast in the series, Walker said: “I’m delighted to be joining the Defoe family and walking in Hannah’s shoes as she picks her way through other people’s marriages and relationships, all the while questioning her own.”

The six-part series is the first drama from former Spooks producer Jane Featherstone’s new production company and will shoot on location in London.